...Pacific Gas & Electric Co. "regrets the spiritual consequences to the tribe" when it built a $15 million water treatment plant in the Mojave Desert...on a bluff above the Colorado River, [where] an ancient pattern of lines inscribed on the desert floor marks the pathway to heaven for Indians who live nearby....Protecting the maze is crucial to the survival of the 1,100-person Fort Mojave Indian Tribe, tribal Chairwoman Nora McDowell [said]...The agreement...commits PG&E to remove the treatment plant as part of a final plan to clean up groundwater tainted by hexavalent chromium...